forked from luck/tmp_suning_uos_patched
2fa9e7e2dc
Drop support for 8-bit and 16-bit xchg and cmpxchg emulation and implements 32-bit xchg with the SWAP/SWAPI instruction. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
345 lines
8.8 KiB
C
345 lines
8.8 KiB
C
/* atomic.h: atomic operation emulation for FR-V
|
|
*
|
|
* For an explanation of how atomic ops work in this arch, see:
|
|
* Documentation/fujitsu/frv/atomic-ops.txt
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_ATOMIC_H
|
|
#define _ASM_ATOMIC_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/types.h>
|
|
#include <asm/spr-regs.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
#error not SMP safe
|
|
#endif
|
|
|
|
/*
|
|
* Atomic operations that C can't guarantee us. Useful for
|
|
* resource counting etc..
|
|
*
|
|
* We do not have SMP systems, so we don't have to deal with that.
|
|
*/
|
|
|
|
/* Atomic operations are already serializing */
|
|
#define smp_mb__before_atomic_dec() barrier()
|
|
#define smp_mb__after_atomic_dec() barrier()
|
|
#define smp_mb__before_atomic_inc() barrier()
|
|
#define smp_mb__after_atomic_inc() barrier()
|
|
|
|
typedef struct {
|
|
int counter;
|
|
} atomic_t;
|
|
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
#define atomic_read(v) ((v)->counter)
|
|
#define atomic_set(v, i) (((v)->counter) = (i))
|
|
|
|
#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
|
|
static inline int atomic_add_return(int i, atomic_t *v)
|
|
{
|
|
unsigned long val;
|
|
|
|
asm("0: \n"
|
|
" orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
|
|
" ckeq icc3,cc7 \n"
|
|
" ld.p %M0,%1 \n" /* LD.P/ORCR must be atomic */
|
|
" orcr cc7,cc7,cc3 \n" /* set CC3 to true */
|
|
" add%I2 %1,%2,%1 \n"
|
|
" cst.p %1,%M0 ,cc3,#1 \n"
|
|
" corcc gr29,gr29,gr0 ,cc3,#1 \n" /* clear ICC3.Z if store happens */
|
|
" beq icc3,#0,0b \n"
|
|
: "+U"(v->counter), "=&r"(val)
|
|
: "NPr"(i)
|
|
: "memory", "cc7", "cc3", "icc3"
|
|
);
|
|
|
|
return val;
|
|
}
|
|
|
|
static inline int atomic_sub_return(int i, atomic_t *v)
|
|
{
|
|
unsigned long val;
|
|
|
|
asm("0: \n"
|
|
" orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
|
|
" ckeq icc3,cc7 \n"
|
|
" ld.p %M0,%1 \n" /* LD.P/ORCR must be atomic */
|
|
" orcr cc7,cc7,cc3 \n" /* set CC3 to true */
|
|
" sub%I2 %1,%2,%1 \n"
|
|
" cst.p %1,%M0 ,cc3,#1 \n"
|
|
" corcc gr29,gr29,gr0 ,cc3,#1 \n" /* clear ICC3.Z if store happens */
|
|
" beq icc3,#0,0b \n"
|
|
: "+U"(v->counter), "=&r"(val)
|
|
: "NPr"(i)
|
|
: "memory", "cc7", "cc3", "icc3"
|
|
);
|
|
|
|
return val;
|
|
}
|
|
|
|
#else
|
|
|
|
extern int atomic_add_return(int i, atomic_t *v);
|
|
extern int atomic_sub_return(int i, atomic_t *v);
|
|
|
|
#endif
|
|
|
|
static inline int atomic_add_negative(int i, atomic_t *v)
|
|
{
|
|
return atomic_add_return(i, v) < 0;
|
|
}
|
|
|
|
static inline void atomic_add(int i, atomic_t *v)
|
|
{
|
|
atomic_add_return(i, v);
|
|
}
|
|
|
|
static inline void atomic_sub(int i, atomic_t *v)
|
|
{
|
|
atomic_sub_return(i, v);
|
|
}
|
|
|
|
static inline void atomic_inc(atomic_t *v)
|
|
{
|
|
atomic_add_return(1, v);
|
|
}
|
|
|
|
static inline void atomic_dec(atomic_t *v)
|
|
{
|
|
atomic_sub_return(1, v);
|
|
}
|
|
|
|
#define atomic_dec_return(v) atomic_sub_return(1, (v))
|
|
#define atomic_inc_return(v) atomic_add_return(1, (v))
|
|
|
|
#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
|
|
#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
|
|
#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
|
|
|
|
#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
|
|
static inline
|
|
unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v)
|
|
{
|
|
unsigned long old, tmp;
|
|
|
|
asm volatile(
|
|
"0: \n"
|
|
" orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
|
|
" ckeq icc3,cc7 \n"
|
|
" ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
|
|
" orcr cc7,cc7,cc3 \n" /* set CC3 to true */
|
|
" and%I3 %1,%3,%2 \n"
|
|
" cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
|
|
" corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
|
|
" beq icc3,#0,0b \n"
|
|
: "+U"(*v), "=&r"(old), "=r"(tmp)
|
|
: "NPr"(~mask)
|
|
: "memory", "cc7", "cc3", "icc3"
|
|
);
|
|
|
|
return old;
|
|
}
|
|
|
|
static inline
|
|
unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v)
|
|
{
|
|
unsigned long old, tmp;
|
|
|
|
asm volatile(
|
|
"0: \n"
|
|
" orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
|
|
" ckeq icc3,cc7 \n"
|
|
" ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
|
|
" orcr cc7,cc7,cc3 \n" /* set CC3 to true */
|
|
" or%I3 %1,%3,%2 \n"
|
|
" cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
|
|
" corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
|
|
" beq icc3,#0,0b \n"
|
|
: "+U"(*v), "=&r"(old), "=r"(tmp)
|
|
: "NPr"(mask)
|
|
: "memory", "cc7", "cc3", "icc3"
|
|
);
|
|
|
|
return old;
|
|
}
|
|
|
|
static inline
|
|
unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v)
|
|
{
|
|
unsigned long old, tmp;
|
|
|
|
asm volatile(
|
|
"0: \n"
|
|
" orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
|
|
" ckeq icc3,cc7 \n"
|
|
" ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
|
|
" orcr cc7,cc7,cc3 \n" /* set CC3 to true */
|
|
" xor%I3 %1,%3,%2 \n"
|
|
" cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
|
|
" corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
|
|
" beq icc3,#0,0b \n"
|
|
: "+U"(*v), "=&r"(old), "=r"(tmp)
|
|
: "NPr"(mask)
|
|
: "memory", "cc7", "cc3", "icc3"
|
|
);
|
|
|
|
return old;
|
|
}
|
|
|
|
#else
|
|
|
|
extern unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v);
|
|
extern unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v);
|
|
extern unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v);
|
|
|
|
#endif
|
|
|
|
#define atomic_clear_mask(mask, v) atomic_test_and_ANDNOT_mask((mask), (v))
|
|
#define atomic_set_mask(mask, v) atomic_test_and_OR_mask((mask), (v))
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* exchange value with memory
|
|
*/
|
|
#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
|
|
|
|
#define xchg(ptr, x) \
|
|
({ \
|
|
__typeof__(ptr) __xg_ptr = (ptr); \
|
|
__typeof__(*(ptr)) __xg_orig; \
|
|
\
|
|
switch (sizeof(__xg_orig)) { \
|
|
case 4: \
|
|
asm volatile( \
|
|
"swap%I0 %2,%M0" \
|
|
: "+m"(*__xg_ptr), "=&r"(__xg_orig) \
|
|
: "r"(x) \
|
|
: "memory" \
|
|
); \
|
|
break; \
|
|
\
|
|
default: \
|
|
__xg_orig = 0; \
|
|
asm volatile("break"); \
|
|
break; \
|
|
} \
|
|
\
|
|
__xg_orig; \
|
|
})
|
|
|
|
#else
|
|
|
|
extern uint32_t __xchg_32(uint32_t i, volatile void *v);
|
|
|
|
#define xchg(ptr, x) \
|
|
({ \
|
|
__typeof__(ptr) __xg_ptr = (ptr); \
|
|
__typeof__(*(ptr)) __xg_orig; \
|
|
\
|
|
switch (sizeof(__xg_orig)) { \
|
|
case 4: __xg_orig = (__typeof__(*(ptr))) __xchg_32((uint32_t) x, __xg_ptr); break; \
|
|
default: \
|
|
__xg_orig = 0; \
|
|
asm volatile("break"); \
|
|
break; \
|
|
} \
|
|
__xg_orig; \
|
|
})
|
|
|
|
#endif
|
|
|
|
#define tas(ptr) (xchg((ptr), 1))
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* compare and conditionally exchange value with memory
|
|
* - if (*ptr == test) then orig = *ptr; *ptr = test;
|
|
* - if (*ptr != test) then orig = *ptr;
|
|
*/
|
|
#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
|
|
|
|
#define cmpxchg(ptr, test, new) \
|
|
({ \
|
|
__typeof__(ptr) __xg_ptr = (ptr); \
|
|
__typeof__(*(ptr)) __xg_orig, __xg_tmp; \
|
|
__typeof__(*(ptr)) __xg_test = (test); \
|
|
__typeof__(*(ptr)) __xg_new = (new); \
|
|
\
|
|
switch (sizeof(__xg_orig)) { \
|
|
case 4: \
|
|
asm volatile( \
|
|
"0: \n" \
|
|
" orcc gr0,gr0,gr0,icc3 \n" \
|
|
" ckeq icc3,cc7 \n" \
|
|
" ld.p %M0,%1 \n" \
|
|
" orcr cc7,cc7,cc3 \n" \
|
|
" sub%I4cc %1,%4,%2,icc0 \n" \
|
|
" bne icc0,#0,1f \n" \
|
|
" cst.p %3,%M0 ,cc3,#1 \n" \
|
|
" corcc gr29,gr29,gr0 ,cc3,#1 \n" \
|
|
" beq icc3,#0,0b \n" \
|
|
"1: \n" \
|
|
: "+U"(*__xg_ptr), "=&r"(__xg_orig), "=&r"(__xg_tmp) \
|
|
: "r"(__xg_new), "NPr"(__xg_test) \
|
|
: "memory", "cc7", "cc3", "icc3", "icc0" \
|
|
); \
|
|
break; \
|
|
\
|
|
default: \
|
|
__xg_orig = 0; \
|
|
asm volatile("break"); \
|
|
break; \
|
|
} \
|
|
\
|
|
__xg_orig; \
|
|
})
|
|
|
|
#else
|
|
|
|
extern uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new);
|
|
|
|
#define cmpxchg(ptr, test, new) \
|
|
({ \
|
|
__typeof__(ptr) __xg_ptr = (ptr); \
|
|
__typeof__(*(ptr)) __xg_orig; \
|
|
__typeof__(*(ptr)) __xg_test = (test); \
|
|
__typeof__(*(ptr)) __xg_new = (new); \
|
|
\
|
|
switch (sizeof(__xg_orig)) { \
|
|
case 4: __xg_orig = __cmpxchg_32(__xg_ptr, __xg_test, __xg_new); break; \
|
|
default: \
|
|
__xg_orig = 0; \
|
|
asm volatile("break"); \
|
|
break; \
|
|
} \
|
|
\
|
|
__xg_orig; \
|
|
})
|
|
|
|
#endif
|
|
|
|
#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
|
|
|
|
#define atomic_add_unless(v, a, u) \
|
|
({ \
|
|
int c, old; \
|
|
c = atomic_read(v); \
|
|
while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
|
|
c = old; \
|
|
c != (u); \
|
|
})
|
|
|
|
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
|
|
|
|
#include <asm-generic/atomic.h>
|
|
#endif /* _ASM_ATOMIC_H */
|